KernelLand/Modules/Network/E1000/e1000.c

   1 /*
   2  * Acess2 E1000 Network Driver
   3  * - By John Hodge (thePowersGang)
   4  *
   5  * e1000.c
   6  * - Intel 8254x Network Card Driver (core)
   7  */
   8 #define DEBUG   1
   9 #define VERSION VER2(0,1)
  10 #include <acess.h>
  11 #include "e1000.h"
  12 #include <modules.h>
  13 #include <drv_pci.h>
  14 #include <IPStack/include/adapters_api.h>
  15 #include <timers.h>     // Time_Delay
  16
  17 const struct sSupportedCard {
  18         Uint16  Vendor, Device;
  19 } caSupportedCards[] = {
  20         {0x8086, 0x100E},       // 82540EM-A Desktop
  21         {0x8086, 0x1010},       // 82546EB-A1 Copper Dual Port
  22         {0x8086, 0x1012},       // 82546EB-A1 Fiber
  23         {0x8086, 0x1019},       // 82547[EG]I Copper
  24         {0x8086, 0x101A},       // 82547EI Mobile
  25         {0x8086, 0x101D},       // 82546EB-A1 Copper Quad Port
  26 };
  27 const int ciNumSupportedCards = sizeof(caSupportedCards)/sizeof(caSupportedCards[0]);
  28
  29 // === PROTOTYPES ===
  30  int    E1000_Install(char **Arguments);
  31  int    E1000_Cleanup(void);
  32 tIPStackBuffer  *E1000_WaitForPacket(void *Ptr);
  33  int    E1000_SendPacket(void *Ptr, tIPStackBuffer *Buffer);
  34 void    E1000_IRQHandler(int Num, void *Ptr);
  35  int    E1000_int_InitialiseCard(tCard *Card);
  36 Uint16  E1000_int_ReadEEPROM(tCard *Card, Uint8 WordIdx);
  37
  38 // === GLOBALS ===
  39 MODULE_DEFINE(0, VERSION, E1000, E1000_Install, E1000_Cleanup, NULL);
  40 tIPStack_AdapterType    gE1000_AdapterType = {
  41         .Name = "E1000",
  42         .Type = ADAPTERTYPE_ETHERNET_1G,        // TODO: Differentiate differnet wire protos and speeds
  43         .Flags = ADAPTERFLAG_OFFLOAD_MAC,       // TODO: IP/TCP/UDP checksum offloading
  44         .SendPacket = E1000_SendPacket,
  45         .WaitForPacket = E1000_WaitForPacket
  46         };
  47 tCard   *gaE1000_Cards;
  48
  49 // === CODE ===
  50 int E1000_Install(char **Arguments)
  51 {
  52          int    card_count = 0;
  53         for( int modelidx = 0; modelidx < ciNumSupportedCards; modelidx ++ )
  54         {
  55                 const struct sSupportedCard     *cardtype = &caSupportedCards[modelidx];
  56                 card_count += PCI_CountDevices(cardtype->Vendor, cardtype->Device);
  57         }
  58         LOG("card_count = %i", card_count);
  59         if( card_count == 0 ) {
  60                 LOG("Zero cards located");
  61                 return MODULE_ERR_NOTNEEDED;
  62         }
  63
  64         // Allocate card array
  65         gaE1000_Cards = calloc(sizeof(tCard), card_count);
  66         if( !gaE1000_Cards ) {
  67                 return MODULE_ERR_MALLOC;
  68         }
  69
  70         // Initialise cards
  71         int card_idx = 0;
  72         for( int modelidx = 0; modelidx < ciNumSupportedCards; modelidx ++ )
  73         {
  74                 const struct sSupportedCard     *cardtype = &caSupportedCards[modelidx];
  75                 for( int id = -1, i = 0; (id = PCI_GetDevice(cardtype->Vendor, cardtype->Device, i)) != -1; i ++ )
  76                 {
  77                         tCard   *card = &gaE1000_Cards[card_idx++];
  78                         card->MMIOBasePhys = PCI_GetValidBAR(id, 0, PCI_BARTYPE_MEMNP);
  79                         if( !card->MMIOBasePhys ) {
  80                                 Log_Warning("E1000", "Dev %i: BAR0 should be non-prefetchable memory", id);
  81                                 continue;
  82                         }
  83
  84                         card->IRQ = PCI_GetIRQ(id);
  85                         IRQ_AddHandler(card->IRQ, E1000_IRQHandler, card);
  86                         PCI_SetCommand(id, PCI_CMD_MEMENABLE|PCI_CMD_BUSMASTER, 0);
  87
  88                         Log_Debug("E1000", "Card %i: %P IRQ %i", card_idx, card->MMIOBasePhys, card->IRQ);
  89
  90                         if( E1000_int_InitialiseCard(card) ) {
  91                                 return MODULE_ERR_MALLOC;
  92                         }
  93
  94                         card->IPStackHandle = IPStack_Adapter_Add(&gE1000_AdapterType, card, card->MacAddr);
  95                 }
  96         }
  97         return MODULE_ERR_OK;
  98 }
  99
 100 int E1000_Cleanup(void)
 101 {
 102         return 0;
 103 }
 104
 105 void E1000_int_ReleaseRXD(void *Arg, size_t HeadLen, size_t FootLen, const void *Data)
 106 {
 107         tCard   **cardptr = Arg;
 108         tCard   *Card = *cardptr;
 109          int    rxd = (Arg - (void*)Card->RXBackHandles) / sizeof(void*);
 110
 111         LOG("RXD %p %i being released", Card, rxd);
 112         ASSERT(rxd >= 0 && rxd < NUM_RX_DESC);
 113
 114         Card->RXDescs[rxd].Status = 0;
 115         Mutex_Acquire(&Card->lRXDescs);
 116         if( rxd == REG32(Card, REG_RDT) ) {
 117                 while( rxd != Card->FirstUnseenRXD && !(Card->RXDescs[rxd].Status & RXD_STS_DD) ) {
 118                         rxd ++;
 119                         if( rxd == NUM_RX_DESC )
 120                                 rxd = 0;
 121                 }
 122                 REG32(Card, REG_RDT) = rxd;
 123                 LOG("Updated RDT=%i", rxd);
 124         }
 125         Mutex_Release(&Card->lRXDescs);
 126 }
 127
 128 tIPStackBuffer *E1000_WaitForPacket(void *Ptr)
 129 {
 130         tCard   *Card = Ptr;
 131
 132         if( Semaphore_Wait(&Card->AvailPackets, 1) != 1 )
 133                 return NULL;
 134
 135         ENTER("pPtr", Ptr);
 136
 137         Mutex_Acquire(&Card->lRXDescs);
 138          int    first_rxd = Card->FirstUnseenRXD;
 139          int    last_rxd = first_rxd;
 140          int    nDesc = 1;
 141         while( last_rxd != Card->LastUnseenRXD  ) {
 142                 if( !(Card->RXDescs[last_rxd].Status & RXD_STS_DD) )
 143                         break;  // Oops, should ahve found an EOP first
 144                 if( Card->RXDescs[last_rxd].Status & RXD_STS_EOP )
 145                         break;
 146                 nDesc ++;
 147                 last_rxd = (last_rxd + 1) % NUM_RX_DESC;
 148         }
 149         Card->FirstUnseenRXD = (last_rxd + 1) % NUM_RX_DESC;
 150         Mutex_Release(&Card->lRXDescs);
 151
 152         LOG("nDesc = %i, first_rxd = %i", nDesc, first_rxd);
 153         tIPStackBuffer *ret = IPStack_Buffer_CreateBuffer(nDesc);
 154          int    rxd = first_rxd;
 155         for( int i = 0; i < nDesc; i ++ )
 156         {
 157                 IPStack_Buffer_AppendSubBuffer(ret, 0, Card->RXDescs[rxd].Length, Card->RXBuffers[rxd],
 158                         E1000_int_ReleaseRXD, &Card->RXBackHandles[rxd]);
 159         }
 160
 161         LEAVE('p', ret);
 162         return ret;
 163 }
 164
 165 int E1000_SendPacket(void *Ptr, tIPStackBuffer *Buffer)
 166 {
 167         tCard   *Card = Ptr;
 168
 169         ENTER("pPtr pBuffer", Ptr, Buffer);
 170
 171          int    nDesc = 0;
 172         size_t  len;
 173         const void      *ptr;
 174         // Count sub-buffers (including splitting cross-page entries)
 175          int    idx = -1;
 176         while( (idx = IPStack_Buffer_GetBuffer(Buffer, idx, &len, &ptr)) != -1 )
 177         {
 178                 if( len > PAGE_SIZE ) {
 179                         LOG("len=%i > PAGE_SIZE", len);
 180                         LEAVE('i', EINVAL);
 181                         return EINVAL;
 182                 }
 183                 if( MM_GetPhysAddr(ptr) + len-1 != MM_GetPhysAddr((char*)ptr + len-1) ) {
 184                         LOG("Buffer %p+%i spans non-contig physical pages", ptr, len);
 185                         nDesc ++;
 186                 }
 187                 nDesc ++;
 188         }
 189
 190         // Request set of TX descriptors
 191         int rv = Semaphore_Wait(&Card->FreeTxDescs, nDesc);
 192         if(rv != nDesc) {
 193                 LEAVE('i', EINTR);
 194                 return EINTR;
 195         }
 196         Mutex_Acquire(&Card->lTXDescs);
 197          int    first_txd = Card->FirstFreeTXD;
 198         Card->FirstFreeTXD = (first_txd + nDesc) % NUM_TX_DESC;
 199          int    last_txd = (first_txd + nDesc-1) % NUM_TX_DESC;
 200
 201         LOG("first_txd = %i, last_txd = %i", first_txd, last_txd);
 202
 203         // Populate buffers
 204         idx = -1;
 205          int txd = first_txd;
 206         while( (idx = IPStack_Buffer_GetBuffer(Buffer, idx, &len, &ptr)) != -1 )
 207         {
 208                 if( MM_GetPhysAddr(ptr) + len-1 != MM_GetPhysAddr((char*)ptr + len-1) )
 209                 {
 210                         size_t  remlen = PAGE_SIZE - ((tVAddr)ptr & (PAGE_SIZE-1));
 211                         // Split in two
 212                         // - First Page
 213                         Card->TXDescs[txd].Buffer = MM_GetPhysAddr(ptr);
 214                         Card->TXDescs[txd].Length = remlen;
 215                         Card->TXDescs[txd].CMD = TXD_CMD_RS;
 216                         txd = (txd + 1) % NUM_TX_DESC;
 217                         // - Second page
 218                         Card->TXDescs[txd].Buffer = MM_GetPhysAddr((char*)ptr + remlen);
 219                         Card->TXDescs[txd].Length = len - remlen;
 220                         Card->TXDescs[txd].CMD = TXD_CMD_RS;
 221                 }
 222                 else
 223                 {
 224                         // Single
 225                         volatile tTXDesc *txdp = &Card->TXDescs[txd];
 226                         txdp->Buffer = MM_GetPhysAddr(ptr);
 227                         txdp->Length = len;
 228                         txdp->CMD = TXD_CMD_RS;
 229                         LOG("%P: %llx %x %x", MM_GetPhysAddr((void*)txdp), txdp->Buffer, txdp->Length, txdp->CMD);
 230                 }
 231                 txd = (txd + 1) % NUM_TX_DESC;
 232         }
 233         Card->TXDescs[last_txd].CMD |= TXD_CMD_EOP|TXD_CMD_IDE|TXD_CMD_IFCS;
 234         Card->TXSrcBuffers[last_txd] = Buffer;
 235
 236         __sync_synchronize();
 237         {
 238                 volatile tTXDesc *txdp = Card->TXDescs + last_txd;
 239                 LOG("%p %P: %llx %x %x", txdp, MM_GetPhysAddr((void*)txdp), txdp->Buffer, txdp->Length, txdp->CMD);
 240                 volatile tTXDesc *txdp_base = MM_MapTemp(MM_GetPhysAddr((void*)Card->TXDescs));
 241                 txdp = txdp_base + last_txd;
 242                 LOG("%p %P: %llx %x %x", txdp, MM_GetPhysAddr((void*)txdp), txdp->Buffer, txdp->Length, txdp->CMD);
 243                 MM_FreeTemp( (void*)txdp_base);
 244         }
 245         // Trigger TX
 246         IPStack_Buffer_LockBuffer(Buffer);
 247         LOG("Triggering TX - Buffers[%i]=%p", last_txd, Buffer);
 248         REG32(Card, REG_TDT) = Card->FirstFreeTXD;
 249         Mutex_Release(&Card->lTXDescs);
 250         LOG("Waiting for TX to complete");
 251
 252         // Wait for completion (lock will block, then release straight away)
 253         IPStack_Buffer_LockBuffer(Buffer);
 254         IPStack_Buffer_UnlockBuffer(Buffer);
 255
 256         // TODO: Check status bits
 257
 258         LEAVE('i', 0);
 259         return 0;
 260 }
 261
 262 void E1000_IRQHandler(int Num, void *Ptr)
 263 {
 264         tCard   *Card = Ptr;
 265
 266         Uint32  icr = REG32(Card, REG_ICR);
 267         if( icr == 0 )
 268                 return ;
 269         LOG("icr = %x", icr);
 270
 271         // Transmit descriptor written
 272         if( (icr & ICR_TXDW) || (icr & ICR_TXQE) )
 273         {
 274                  int    nReleased = 0;
 275                  int    txd = Card->LastFreeTXD;
 276                  int    nReleasedAtLastDD = 0;
 277                  int    idxOfLastDD = txd;
 278                 // Walk descriptors looking for the first non-complete descriptor
 279                 LOG("TX %i:%i", Card->LastFreeTXD, Card->FirstFreeTXD);
 280                 while( txd != Card->FirstFreeTXD )
 281                 {
 282                         nReleased ++;
 283                         if(Card->TXDescs[txd].Status & TXD_STS_DD) {
 284                                 nReleasedAtLastDD = nReleased;
 285                                 idxOfLastDD = txd;
 286                         }
 287                         txd ++;
 288                         if(txd == NUM_TX_DESC)
 289                                 txd = 0;
 290                 }
 291                 if( nReleasedAtLastDD )
 292                 {
 293                         // Unlock buffers
 294                         txd = Card->LastFreeTXD;
 295                         LOG("TX unlocking range %i-%i", txd, idxOfLastDD);
 296                         while( txd != (idxOfLastDD+1)%NUM_TX_DESC )
 297                         {
 298                                 if( Card->TXSrcBuffers[txd] ) {
 299                                         LOG("- Unlocking %i:%p", txd, Card->TXSrcBuffers[txd]);
 300                                         IPStack_Buffer_UnlockBuffer( Card->TXSrcBuffers[txd] );
 301                                         Card->TXSrcBuffers[txd] = NULL;
 302                                 }
 303                                 txd ++;
 304                                 if(txd == NUM_TX_DESC)
 305                                         txd = 0;
 306                         }
 307                         // Update last free
 308                         Card->LastFreeTXD = txd;
 309                         Semaphore_Signal(&Card->FreeTxDescs, nReleasedAtLastDD);
 310                         LOG("nReleased = %i", nReleasedAtLastDD);
 311                 }
 312                 else
 313                 {
 314                         LOG("No completed TXDs");
 315                 }
 316         }
 317
 318         if( icr & ICR_LSC )
 319         {
 320                 // Link status change
 321                 LOG("LSC");
 322                 // TODO: Detect link drop/raise and poke IPStack
 323         }
 324
 325         if( icr & ICR_RXO )
 326         {
 327                 LOG("RX Overrun");
 328         }
 329
 330         // Pending packet (s)
 331         if( icr & ICR_RXT0 )
 332         {
 333                  int    nPackets = 0;
 334                 LOG("RX %i:%i", Card->LastUnseenRXD, Card->FirstUnseenRXD);
 335                 while( (Card->RXDescs[Card->LastUnseenRXD].Status & RXD_STS_DD) )
 336                 {
 337                         if( Card->RXDescs[Card->LastUnseenRXD].Status & RXD_STS_EOP )
 338                                 nPackets ++;
 339                         Card->LastUnseenRXD ++;
 340                         if( Card->LastUnseenRXD == NUM_RX_DESC )
 341                                 Card->LastUnseenRXD = 0;
 342
 343                         if( Card->LastUnseenRXD == Card->FirstUnseenRXD )
 344                                 break;
 345                 }
 346                 Semaphore_Signal(&Card->AvailPackets, nPackets);
 347                 LOG("nPackets = %i", nPackets);
 348         }
 349
 350         icr &= ~(ICR_RXT0|ICR_LSC|ICR_TXQE|ICR_TXDW);
 351         if( icr )
 352                 Log_Warning("E1000", "Unhandled ICR bits 0x%x", icr);
 353 }
 354
 355 // TODO: Move this function into Kernel/drvutil.c
 356 /**
 357  * \brief Allocate a set of buffers in hardware mapped space
 358  *
 359  * Allocates \a NumBufs buffers using shared pages (if \a BufSize is less than a page) or
 360  * as a set of contiugious allocations.
 361  */
 362 int DrvUtil_AllocBuffers(void **Buffers, int NumBufs, int PhysBits, size_t BufSize)
 363 {
 364         if( BufSize >= PAGE_SIZE )
 365         {
 366                 const int       pages_per_buf = BufSize / PAGE_SIZE;
 367                 ASSERT(pages_per_buf * PAGE_SIZE == BufSize);
 368                 for( int i = 0; i < NumBufs; i ++ ) {
 369                         Buffers[i] = (void*)MM_AllocDMA(pages_per_buf, PhysBits, NULL);
 370                         if( !Buffers[i] )       return 1;
 371                 }
 372         }
 373         else
 374         {
 375                 size_t  ofs = 0;
 376                 const int       bufs_per_page = PAGE_SIZE / BufSize;
 377                 ASSERT(bufs_per_page * BufSize == PAGE_SIZE);
 378                 void    *page = NULL;
 379                 for( int i = 0; i < NumBufs; i ++ )
 380                 {
 381                         if( ofs == 0 ) {
 382                                 page = (void*)MM_AllocDMA(1, PhysBits, NULL);
 383                                 if( !page )     return 1;
 384                         }
 385                         Buffers[i] = (char*)page + ofs;
 386                         ofs += BufSize;
 387                         if( ofs >= PAGE_SIZE )
 388                                 ofs = 0;
 389                 }
 390         }
 391         return 0;
 392 }
 393
 394 int E1000_int_InitialiseCard(tCard *Card)
 395 {
 396         ENTER("pCard", Card);
 397
 398         // Map required structures
 399         Card->MMIOBase = (void*)MM_MapHWPages( Card->MMIOBasePhys, 7 );
 400         if( !Card->MMIOBase ) {
 401                 Log_Error("E1000", "%p: Failed to map MMIO Space (7 pages)", Card);
 402                 LEAVE('i', 1);
 403                 return 1;
 404         }
 405
 406         // --- Read MAC address from EEPROM ---
 407         {
 408                 Uint16  macword;
 409                 macword = E1000_int_ReadEEPROM(Card, 0);
 410                 Card->MacAddr[0] = macword & 0xFF;
 411                 Card->MacAddr[1] = macword >> 8;
 412                 macword = E1000_int_ReadEEPROM(Card, 1);
 413                 Card->MacAddr[2] = macword & 0xFF;
 414                 Card->MacAddr[3] = macword >> 8;
 415                 macword = E1000_int_ReadEEPROM(Card, 2);
 416                 Card->MacAddr[4] = macword & 0xFF;
 417                 Card->MacAddr[5] = macword >> 8;
 418         }
 419         Log_Log("E1000", "%p: MAC Address %02x:%02x:%02x:%02x:%02x:%02x",
 420                 Card,
 421                 Card->MacAddr[0], Card->MacAddr[1],
 422                 Card->MacAddr[2], Card->MacAddr[3],
 423                 Card->MacAddr[4], Card->MacAddr[5]);
 424
 425         // --- Prepare for RX ---
 426         LOG("RX Preparation");
 427         Card->RXDescs = (void*)MM_AllocDMA(1, 64, NULL);
 428         if( !Card->RXDescs ) {
 429                 LEAVE('i', 2);
 430                 return 2;
 431         }
 432         if( DrvUtil_AllocBuffers(Card->RXBuffers, NUM_RX_DESC, 64, RX_DESC_BSIZE) ) {
 433                 LEAVE('i', 3);
 434                 return 3;
 435         }
 436         for( int i = 0; i < NUM_RX_DESC; i ++ )
 437         {
 438                 Card->RXDescs[i].Buffer = MM_GetPhysAddr(Card->RXBuffers[i]);
 439                 Card->RXDescs[i].Status = 0;    // Clear RXD_STS_DD, gives it to the card
 440                 Card->RXBackHandles[i] = Card;
 441         }
 442
 443         REG64(Card, REG_RDBAL) = MM_GetPhysAddr((void*)Card->RXDescs);
 444         REG32(Card, REG_RDLEN) = NUM_RX_DESC * 16;
 445         REG32(Card, REG_RDH) = 0;
 446         REG32(Card, REG_RDT) = NUM_RX_DESC;
 447         // Hardware size, Multicast promisc, Accept broadcast, Interrupt at 1/4 Rx descs free
 448         REG32(Card, REG_RCTL) = RX_DESC_BSIZEHW | RCTL_MPE | RCTL_BAM | RCTL_RDMTS_1_4;
 449         Card->FirstUnseenRXD = 0;
 450         Card->LastUnseenRXD = 0;
 451
 452         // --- Prepare for TX ---
 453         LOG("TX Preparation");
 454         Card->TXDescs = (void*)MM_AllocDMA(1, 64, NULL);
 455         if( !Card->RXDescs ) {
 456                 LEAVE('i', 4);
 457                 return 4;
 458         }
 459         LOG("Card->RXDescs = %p [%P]", Card->TXDescs, MM_GetPhysAddr((void*)Card->TXDescs));
 460         for( int i = 0; i < NUM_TX_DESC; i ++ )
 461         {
 462                 Card->TXDescs[i].Buffer = 0;
 463                 Card->TXDescs[i].CMD = 0;
 464         }
 465         REG64(Card, REG_TDBAL) = MM_GetPhysAddr((void*)Card->TXDescs);
 466         REG32(Card, REG_TDLEN) = NUM_TX_DESC * 16;
 467         REG32(Card, REG_TDH) = 0;
 468         REG32(Card, REG_TDT) = 0;
 469         // Enable, pad short packets
 470         REG32(Card, REG_TCTL) = TCTL_EN | TCTL_PSP | (0x0F << TCTL_CT_ofs) | (0x40 << TCTL_COLD_ofs);
 471         Card->FirstFreeTXD = 0;
 472
 473         // -- Prepare Semaphores
 474         Semaphore_Init(&Card->FreeTxDescs, NUM_TX_DESC, NUM_TX_DESC, "E1000", "TXDescs");
 475         Semaphore_Init(&Card->AvailPackets, 0, NUM_RX_DESC, "E1000", "RXDescs");
 476
 477         // --- Prepare for full operation ---
 478         LOG("Starting card");
 479         REG32(Card, REG_CTRL) = CTRL_SLU|CTRL_ASDE;     // Link up, auto speed detection
 480         REG32(Card, REG_IMS) = 0x1F6DC; // Interrupt mask
 481         (void)REG32(Card, REG_ICR);     // Discard pending interrupts
 482         REG32(Card, REG_RCTL) |= RCTL_EN;
 483         LEAVE('i', 0);
 484         return 0;
 485 }
 486
 487 Uint16 E1000_int_ReadEEPROM(tCard *Card, Uint8 WordIdx)
 488 {
 489         REG32(Card, REG_EERD) = ((Uint32)WordIdx << 8) | 1;
 490         Uint32  tmp;
 491         while( !((tmp = REG32(Card, REG_EERD)) & (1 << 4)) ) {
 492                 // TODO: use something like Time_MicroDelay instead
 493                 Time_Delay(1);
 494         }
 495
 496         return tmp >> 16;
 497 }